A red light camera in Kingsport, Tennessee caused a dump truck to overturn in a massive multicar accident on Wednesday that snarled traffic for hours. The Kingsport Times-News was on the scene to cover the incident at the intersection of Stone Drive at and New Beasonwell Road just as it was for another Kingsport red light camera accident that caused critical injuries earlier this month.

The incident was sparked by a vehicle that stopped short at the intersection, presumably to avoid a red light camera citation. According to the Times-News, this surprised Thomas Aaron Johnson, 29, who was following behind in a black 2001 Pontiac Grand Am. To avoid slamming into the car that had suddenly stopped, Johnson swerved into the right-hand lane, side-swiping a 1985 Mack DM6 dump truck driven by Larry Kent Simmons, 56. Simmons himself swerved, hit a third car, overturned and sent his load of dirt all over the road and on top of a parked car.

Police do not believe Johnson was speeding. Officers charged the Pontiac driver only with making an improper lane change in addition to unrelated paperwork violations. No injuries were reported.

Independent research shows that red light cameras cause a measurable increase in collisions, especially rear end accidents.